Prayers for safety!

I mother-in-law left yesterday morning for Tanzania Africa on a missionary trip. She is traveling with the rest of her group (they have not arrived yet...LOOOOOONG FLIGHT!) Any prayers you can offer up for their safety and their mission would be wonderful. They are going to be working with a school/orphanage for 2 weeks. She is very excited that God has called her to use the skills He has equiped her with for this mission.